Vegetation recovery and landscape change assessment at Chiufenershan landslide area caused by Chichi earthquake in central Taiwan |
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Authors: | Chao-Yuan Lin Chin-Wei Chuang Wen-Tzu Lin Wen-Chieh Chou |
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Institution: | (1) Department of Soil and Water Conservation, National Chung Hsing University, Taichung City, 40227, Taiwan, ROC;(2) Department of Design for Sustainable Environment, Ming Dao University, Changhua County, 52345, Taiwan, ROC;(3) Department of Civil Engineering and Engineering Informatics, Chung Hua University, #707, Sec.2, Wufu Road, Hsinchu City, 30012, Taiwan, ROC |
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Abstract: | This study discusses vegetation recovery and land cover change with reference to the Chiufenershan landslide, a major disaster
caused by the Chichi earthquake, 21 September 1999. Image classification technology, landscape indicators from multi-temporal
remotely sensed data and a field survey provide the data. Image differencing methods and threshold values coupled with pre-
and post-quake satellite images were used. Multi-temporal images in combination with various vegetation indices were drawn
on to classify land cover patterns and discuss differences and suitability of indices. Landscape indicators and field investigations
fed into an investigation of vegetation recovery and landscape change. The study results show that the best image classification
system is original wavebands coupled with a cropping management factor index (CMFI). The land cover analysis shows that areas
of forest and grass are increasing and areas of landslide are decreasing. From the field investigation, because the left and
right sides of the landslide area were not disturbed by the earthquake, their calculated similarity index is the highest (30.08%).
Miscanthus floridulus is the most dominant pioneer plant at the landslide collapse area with an importance value index (IVI) of 63.6%. |
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